pollard



@man ftent gaf-w1 @mm WiLniAM n. POLLARD, OF SENECA FALLS, NEW YORK, ASSIGNOR To DOWNS OOfs MANUFACTURING COMPANY, OF SAME PLAGE.

l Letters Patent No. 73,038, dated Jdmtarg/ Y, 1868.

IMPROVEMENT IN Puur-VALVES.

TO ALL WHOM ITMAY CONCERN: f

Be it known that I, WlLLIAM II. PoLLAnn,of Seneca Falls, in the county of Seneca, and State of NewYork, have invented a certain nel'w and useful' Improvement in Pumps; and I do hereby declare that the following is a full and exact description thereof, reference' being had to the accompanying drawings, making part of this specification.

Figure 1 is a central vertical section of the lower portion of my improved pump.

Figure 2, a perspective view of the under side of: the induction-valve.

Like letters of reference indicate corresponding parts in both gures'.

My improved pump is intended more particularly for 'use in wells formed by driven tubing, where much sand is raised.

The invention consists in the employment, in combination with an elevated valve-seat, of a rubber or equivalent disk, of concave form, attached on the. under side of the valve, and acting .in such manner, by its expansion, in closing, as to sweep off all sand from the valve-seat, and thus insure a close and tight packing.

As represented in th-e drawings, A is a pump-cylinder of ordinary form, B the plunger, C the base of the pump, and D is the end of the tubing, screwing therein. The base of the pump is provided with an elevated scat, a, leaving a deep groove, b, all around, for the deposit .of the sand that is drawn into the pump. The induction-valve consistsof a ring, E, of leather, fitting between the shoulders c c, and provided with a tongue, 0l,

with which is connected a weight, f. On 'the bottom of this valve is attached a disk, y, of concave form on its under side, preferably made o f rubber or leather, and of such size as to cover the valve-seat when it strikes thereon.

The great diliiculty in operating pumps connected with driven tubing, occurs 'from the sand which is drawn in and obstructs the lower valve. To remedy this, the valve-seat has before been elevated., to allow the sand to deposit outside; but in this' case, even, the grains lodge upon the top of the seat, and prevent the valve from closing tightly. I prevent this difficulty by the employment of the concave disk g, which, when it strikes the scat in the closing of the'valve, spreadsA out or expands, and thus brushes the sand from place on the seat. This device is very eii`ective for this purpose, and produces a. very tight packing in the closing of the valve. Since the expansive action of the disk upon the seat is required to be but very slight, it willbe seen that under ordinnry circumstances there cnn be'no danger from rupture or permanent expansion, if the disk is well made, and oi sniiicient thickness. It' there should be diiiioulty from this source, however, the disk'may be stiii`ened by 'radial strips of light spring metal riveted thereto.

In addition to the special advantage above mentioncdmhe concavity ofthe disk` allows it at all times to tit and adapt itself to the top of the scat, whether the valve proper stands in'a line with the seat or not. Asimplc plane surface would not do this. A

I do not claim broadly an elevated valve-seat, as I am aware that it has been before known; but,

What I claim as my invention, and desire to secure by Letters Patent, is-

The combination of the concave diskg of the valve with the elevated seat a, arranged as described, and

operating in the mann-er and for the purpose specified.

In witness whereof, )I have hereunto signed my name, in the presence of two subscribing witnesses.

WILLIAM H. POLLARD.

Witnesses:

CHARLES O. WHARTENLY, PETER VAN ZANpr, 

